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Bound states in the continuum and high-Q resonances supported by a dielectric ridge on a slab waveguide

Photonics Research 2018年第11期6卷 1084-1093页

作者： evgeni a.bezus DMITRY A.BYKOV LEONID L.DOSKOLOVICH Image Processing Systems Institute-Branch of the Federal Scientific Research Centre“Crystallography and Photonics”of the Russian Academy of Sciences 151 Molodogvardeyskaya St.Samara 443001Russia Samara National Research University 34 Moskovskoe ShosseSamara 443086Russia

We investigate the diffraction of the guided modes of a dielectric slab waveguide on a simple integrated structure consisting of a single dielectric ridge on the surface of the waveguide. Numerical simulations based on aperiodic rigorous coupled-wave analysis demonstrate the existence of sharp resonant features and bound states in the continuum(BICs) in the reflectance and transmittance spectra occurring at the oblique incidence of a transverseelectric(TE)-polarized guided mode on the ridge. Using the effective index method, we explain the resonances by the excitation of cross-polarized modes of the ridge. Formation of the BICs are confirmed using a theoretical model based on coupled-wave theory. The model suggests that the BICs occur due to the coupling of quasi-TE and quasi-transverse-magnetic modes of the structure. Simple analytical expressions for the angle of incidence and the ridge width predicting the location of the BICs are obtained. The existence of high-Q resonances and BICs enables using the considered integrated structure for sensing, transformation of optical signals, and enhancing nonlinear light–matter interactions. Due to the Lorentzian line shape of the resonances near the BICs, the structure is also promising for filtering applications.

关键词： Bound states high-Q resonances slab waveguide TE BIC

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Integrated flat-top reflection filters operating near bound states in the continuum

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Photonics Research 2019年第11期7卷 1314-1322页

作者： Leonid L.Doskolovich evgeni a.bezus Dmitry A.Bykov Image Processing Systems Institute-Branch of the Federal Scientific Research Centre"Crystallography and Photonics"of Russian Academy of Sciences Samara 443001Russia Samara National Research University Samara 443086Russia

We propose and theoretically and numerically investigate narrowband integrated filters consisting of identical resonant dielectric ridges on the surface of a single-mode dielectric slab waveguide. The proposed composite structures operate near a bound state in the continuum(BIC) and enable spectral filtering of transverseelectric-polarized guided modes propagating in the waveguide. We demonstrate that by proper choice of the distances between the ridges, flat-top reflectance profiles with steep slopes and virtually no sidelobes can be obtained using just a few ridges. In particular, the structure consisting of two ridges can optically implement the second-order Butterworth filter, whereas at a larger number of ridges, excellent approximations to higher-order Butterworth filters can be achieved. Owing to the BIC supported by the ridges constituting the composite structure, the flat-top reflection band can be made arbitrarily narrow without increasing structure size. In addition to the filtering properties, the investigated structures support another type of BIC-the Fabry–Perot BIC-arising when the distances between adjacent ridges meet the Fabry–Perot resonance condition. In the vicinity of the Fabry–Perot BIC, an effect similar to electromagnetically induced transparency is observed, namely, sharp transmittance peaks against the background of a wide transmittance dip.

关键词： filters Butterworth filtering

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维普期刊数据库

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Two-groove narrowband transmission filter integrated into a slab waveguide

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Photonics Research 2018年第1期9卷 61-65页

作者： LEONID L. DOSKOLOVICH evgeni A. bezus AND DMITRY A. BYKOV Image Processing Systems Institute-Branch of the Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences 151 Molodogvardeyskaya St. Samara 443001 Russia Samara National Research University 34 Moskovskoe Shosse Samara 443086 Russia

We propose a simple integrated narrowband filter consisting of two grooves on the surface of a slab *** filtering is performed in transmission at oblique incidence due to excitation of an eigenmode of the structure localized at a ridge cavity between the grooves. For the considered parameters, zero reflectance and unity transmittance are achieved at resonant conditions. The width and location of the transmittance peak can be controlled by changing the widths of the grooves and of the ridge, respectively. The proposed filter may find application in waveguide-integrated spectrometers.

关键词：平板波导滤波器通讯技术技术创新

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